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x - 12%x = 88%x = 0,88x ->>> ilość gołębi pana Jana
x + 0,88x = 47
1,88 x = 47 //:1,88x
x = 25
47 - 25 = 22
odp. Pan Kazimierz ma 25 gołębi a pan Jan 22 gołębie.